The images you see above and below have been posted on Weibo and republished by Slashleaks, and they are supposed to portray case templates from third-party manufacturers for the iPhones of 2019. Accessories manufacturers are building these molds based on technical drawings and specific measurements to create cabinets that answer phones, sometimes even without access to phones.
The image that shows the back reveals the configuration of the triple camera, but with a slight distortion: it seems that the lens of the camera will be slightly larger than the LED flash, as opposed to what we have seen leak and render until now. Or, since the whole part of the camera will be a cut-out in cases, it's just a overkill in mold design.
A recent report suggested that the third added lens will be a super wide-angle 12MP lens, complementing the current configuration of the main camera and the telephoto lens. The front image (below) does not seem to show any design changes, although some reports claim that Apple may be narrowing the threshold a bit.
We'll add that to the list or the rumors and leaks of iPhone 11 and iPhone 11 Max, and we'll keep you posted as soon as something new appears.